We will find the determinant of the 4×4 matrix with the cofactor expansion method, also called Laplace expansion. But first we do elementary operations with the rows in order to transform

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We’re asked to calculate the determinant of the following 4×4 matrix: A=\begin{pmatrix}-1 & {1} & 4 & 2 \\2 & -1 & 2 & 5 \\1 &2 & 3& 4\\3& 4& -1 & 2\end{pmatrix} Recall that only square matrices

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